The Man Who Memorised Nonsense So You Don’t Have To

In the 1880s, a German psychologist called Hermann Ebbinghaus sat alone in a Berlin room and did something that sounds like a peculiar form of self-punishment. He made up hundreds of meaningless three-letter syllables – DAX, BUP, LOK, that sort of thing – and spent his days memorising them, then testing himself on how many he could recall hours, days, and weeks later. No research assistant. No funding body. Just a man, a notebook, and an impressive tolerance for tedium.

What he found changed how we understand memory entirely. Most people, including most students, have never heard of it.

Ebbinghaus Drew a Curve

Ebbinghaus drew a curve. It slopes down steeply from the moment you learn something, then levels off into a long, slow tail. Within twenty-four hours of learning a new fact, you've forgotten roughly half of it. By the end of the week, most of the rest has gone. He called it the forgetting curve, and frankly, it's alarming to look at.

How soon should you review to beat the forgetting curve?

But here is the part that matters. Every time you come back to something just before it vanishes, the curve resets – and resets a little flatter. The fall gets gentler. The fact hangs around longer. Come back again a few days later and it flattens further still. Do this four or five times, spacing the repetitions out across days and weeks, and the thing you are trying to learn stops feeling like something you're gripping and starts feeling like something that just lives in you.

This is called the spacing effect, and the reason it works is neurological rather than motivational. Memory is not a cupboard. You do not put something in, close the door, and retrieve it later unchanged. Memory is built during sleep and the quiet hours between sessions, when the brain decides which fragments are worth the biological cost of keeping. Each time you return to a piece of information and retrieve it – actually pull it back up rather than just reading it again – your brain treats that effort as a signal that this particular thing keeps being needed. So it reinforces the connection. The wiring gets thicker, in a very literal sense.

Why Cramming Feels Productive and Isn’t

Cramming does not do this. Cramming feels tremendously productive, which is exactly the problem. You sit with your notes for three hours the night before an exam, the material swimming in your working memory, everything just about accessible – and it produces a convincing impression of knowing. Then you sleep, and the brain quietly files almost none of it as worth keeping, because nothing asked for it more than once. By the following afternoon, the cupboard is bare.

The practical implication of Ebbinghaus's lonely Berlin experiment is straightforward. Twenty minutes today, twenty minutes in three days, twenty minutes next week does more than two hours the night before. Not because spreading it out feels nicer, but because your brain physically consolidates the memory between the sessions rather than during them. The learning happens in the gaps. The revision session is just the trigger.

Ebbinghaus never applied any of this to himself in any useful way. He just kept memorising nonsense syllables until he'd proved the point. Which, honestly, feels about right.